Lens calibration gauge



FIG. 1 is a top plan view of a lens calibration gauge showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is an opposite side elevational view thereof;

FIG. 5 is rear elevational view thereof;

FIG. 6 is a bottom view thereof; and

FIG. 7 is cross sectional view thereof taken along lines 7--7 of FIG. 1. 

The ornamental design for a lens calibration gauge, as shown and described. 